有沒有一種規(guī)范的方法可以在Objective C中將數(shù)組隨機(jī)化？
3 回答
繁華開滿天機(jī)
TA貢獻(xiàn)1816條經(jīng)驗(yàn) 獲得超4個(gè)贊
我的解決方案是一個(gè)類別方法，該方法返回具有隨機(jī)元素（使用arc4random）的數(shù)組的副本（自動(dòng)發(fā)布）。
@interface NSArray (CMRandomised)
/* Returns a copy of the array with elements re-ordered randomly */
- (NSArray *)randomised;
@end
/* Returns a random integer number between low and high inclusive */
static inline int randomInt(int low, int high)
{
return (arc4random() % (high-low+1)) + low;
}
@implementation NSArray (CMRandomised)
- (NSArray *)randomised
{
NSMutableArray *randomised = [NSMutableArray arrayWithCapacity:[self count]];
for (id object in self) {
NSUInteger index = randomInt(0, [randomised count]);
[randomised insertObject:object atIndex:index];
}
return randomised;
}
@end
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